To cite package ‘risdr’ in publications use:

  Olorede, K. O. (2026). risdr: Regularised and Information-Theoretic
  Sufficient Dimension Reduction (R package version 0.4.0).
  https://doi.org/10.32614/CRAN.package.risdr

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {risdr: Regularised and Information-Theoretic Sufficient Dimension Reduction},
    author = {Kabir Opeyemi Olorede},
    year = {2026},
    doi = {10.32614/CRAN.package.risdr},
    note = {R package version 0.4.0},
    url = {https://CRAN.R-project.org/package=risdr},
  }

  Olorede, K. O., and Yahya, W. B. (2019). A New Covariance Estimator
  for Sufficient Dimension Reduction in High-Dimensional and Undersized
  Sample Problems. arXiv:1909.13017 [stat.ME].
  https://doi.org/10.48550/arXiv.1909.13017

A BibTeX entry for LaTeX users is

  @Misc{,
    title = {A New Covariance Estimator for Sufficient Dimension Reduction in High-Dimensional and Undersized Sample Problems},
    author = {Kabir Opeyemi Olorede and Waheed Babatunde Yahya},
    year = {2019},
    note = {arXiv:1909.13017 [stat.ME]},
    doi = {10.48550/arXiv.1909.13017},
    url = {https://arxiv.org/abs/1909.13017},
  }

The first public development release, risdr 0.3.0, is archived at
https://doi.org/10.5281/zenodo.21418002. The first CRAN release, risdr
0.3.1, is archived at https://doi.org/10.5281/zenodo.21728851. The
Zenodo concept DOI for all versions is
https://doi.org/10.5281/zenodo.21728850.